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US 8,476,875 B2Granted
TV set top box with an improved ability to survive a transient signal
AssigneeAllegro MicroSystems, LLC
InventorEric J. Reicher
Life of this patent
Estimating the term…
Abstract
A set top box used in a satellite TV system includes a diode coupled in a particular way to better protect an adjustable linear regulator used in the set top box from transient voltages as may result from lighting or the like.
Claims22
An electronic circuit, comprising:
- a switching regulator comprising:
- a switching regulator input node at which an input voltage is received;
- a voltage holding node;
- a capacitor coupled at one end to the voltage holding node and coupled at the other end to a reference voltage;
- and
- a switching regulator control node, wherein the electronic circuit further comprises:
- a reverse current blocking circuit comprising first and second nodes, wherein the first node is coupled to the voltage holding node and the second node is coupled to a regulated voltage output node, wherein the reverse current blocking circuit is configured to prevent a current from flowing from the regulated voltage output node into the capacitor;
- an adjustable linear regulator;
- wherein the reverse current blocking circuit is coupled between the switching regulator and the adjustable linear regulator;
- and
- a switching regulator controller circuit coupled between the regulated voltage output node and the switching regulator control node, wherein the switching regulator is configured to generate a regulated voltage at the regulated voltage output node.
8 more elements
An electronic circuit, comprising:
- a switching regulator comprising:
- a switching regulator input node at which an input voltage is received;
- a voltage holding node;
- a capacitor coupled at one end to the voltage holding node and coupled at the other end to a reference voltage;
- and
- a switching regulator control node;
- wherein the electronic circuit further comprises:
- a reverse current blocking circuit comprising first and second nodes, wherein the first node is coupled to the voltage holding node and the second node is coupled to a regulated voltage output node, wherein the reverse current blocking circuit is configured to prevent a current from flowing from the regulated voltage output node into the capacitor;
- an adjustable linear regulator;
- wherein the reverse current blocking circuit is coupled between the switching regulator and the adjustable linear regulator;
- a switching regulator controller circuit coupled between the regulated voltage output node and the switching regulator control node, wherein the switching regulator is configured to generate a regulated voltage at the regulated voltage output node;
- and
- a resistor and/or an inductor coupled between the adjustable linear regulator and a circuit output node, wherein a circuit output signal is generated at the circuit output node related to the regulated voltage.
10 more elements
Dependencies are inferred from the claim text.